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Title: Simulations of Seismic Wave Propagation on Mars

In this paper, we present global and regional synthetic seismograms computed for 1D and 3D Mars models based on the spectral-element method. For global simulations, we implemented a radially-symmetric Mars model with a 110 km thick crust. For this 1D model, we successfully benchmarked the 3D seismic wave propagation solver SPECFEM3D_GLOBE against the 2D axisymmetric wave propagation solver AxiSEM at periods down to 10 s. We also present higher-resolution body-wave simulations with AxiSEM down to 1 s in a model with a more complex 1D crust, revealing wave propagation effects that would have been difficult to interpret based on ray theory. For 3D global simulations based on SPECFEM3D_GLOBE, we superimposed 3D crustal thickness variations capturing the distinct crustal dichotomy between Mars’ northern and southern hemispheres, as well as topography, ellipticity, gravity, and rotation. The global simulations clearly indicate that the 3D crust speeds up body waves compared to the reference 1D model, whereas it significantly changes surface waveforms and their dispersive character depending on its thickness. We also perform regional simulations with the solver SES3D based on 3D crustal models derived from surface composition, thereby addressing the effects of various distinct crustal features down to 2 s. The regional simulationsmore » confirm the strong effects of crustal variations on waveforms. Finally, we conclude that the numerical tools are ready for examining more scenarios, including various other seismic models and sources.« less
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6] ;  [7] ;  [3] ;  [2] ;  [8] ;  [9]
  1. Univ. of Nice Sophia Antipolis, Nice (France). CNRS-OCA-IRD-Geoazur
  2. Princeton Univ., NJ (United States)
  3. Federal Inst. of Technology (ETH), Zurich (Switzerland)
  4. Univ. of Oxford (United Kingdom)
  5. Univ. of Cote d'Azur, Nice (France). Lab. Lagrange. CNRS. Observatory of Cote d'Azur
  6. Royal Observatory of Belgium, Brussels (Belgium)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. Paris Diderot Univ. (France). Inst. of Physics of the Globe of Paris-Sorbonne Paris City
  9. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
Publication Date:
Report Number(s):
LA-UR-17-22631
Journal ID: ISSN 0038-6308
Grant/Contract Number:
AC52-06NA25396; 157133
Type:
Accepted Manuscript
Journal Name:
Space Science Reviews
Additional Journal Information:
Journal Volume: 211; Journal Issue: 1-4; Journal ID: ISSN 0038-6308
Publisher:
Springer
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; Swiss National Science Foundation (Switzerland)
Contributing Orgs:
Princeton Univ., NJ (United States); Univ. of Oxford (United Kingdom); Univ. of Cote d'Azur, Nice (France); Royal Observatory of Belgium, Brussels (Belgium); Paris Diderot Univ. (France); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Planetary Sciences; Mars; seismic; single station; spectral element; normal modes; body waves computational seismology; crust; numerical methods; surface waves
OSTI Identifier:
1369205